Belt buckle



FIG. 1 is a front elevational view of a belt buckle showing my new design;

FIG. 2 is a right side elevational view thereof, the left side being substantially similar thereto;

FIG. 3 is a bottom plan view thereof, the top plan being substantially similar thereto; and

FIG. 4 is a rear elevational view thereof. 

The ornamental design for a belt buckle, as shown and described. 